Ok thanks for the advice. So far this is what I have tried:

1) cleaned out any debri in the strainer basket.
2) Tried to turn the impeller through the strainer basket with a screwdriver; it barely budged.

When I turn the power on, I can hear a hum and smell a burnt electrical smell. By then the circuit breaker had tripped.

Any ideas? I'm trying to narrow down whether this is a capacitor, motor, or pump issue. Any other real simple things I can do to diagnose? Thanks!